EBK PHYSICS FOR SCIENTISTS & ENGINEERS
EBK PHYSICS FOR SCIENTISTS & ENGINEERS
5th Edition
ISBN: 9780134296074
Author: GIANCOLI
Publisher: VST
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Chapter 29, Problem 70GP

A flashlight can be made that is powered by the induced current from a magnet moving through a coil of wire. The coil and magnet are inside a plastic tube that can be shaken causing the magnet to move back and forth through the coil. Assume the magnet has a maximum field strength of 0.05 T. Make reasonable assumptions and specify the size of the coil and the number of turns necessary to light a standard 1-watt, 3-V flashlight bulb.

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A generator has a 46-turn coil with an area of 0.07 m2 that turns at 25.0 rad/s in a 0.48 T magnetic field. What is the current through the  coil when the normal to the coil makes an angle of 30o with the magnetic field? The resistance in the coil is 7.84 Ohms. Give your answer in Amperes.
Your camping buddy has an idea for a light to go inside your tent. He happens to have a powerful (and heavy!) horseshoe magnet that he bought at a surplus store. This magnet creates a 0.262 T field between two pole tips 13.6 cm apart. His idea is to build a hand-cranked generator with a rotating 6.8 cm radius semicircle between the pole tips. He thinks you can make enough current to fully light a 2.66 Ω lightbulb rated at 7.48 W. That's not super bright, but it should be bright enough. With what frequency (in Hz) will you have to turn the crank for the maximum current to fully light the bulb?
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